It will depend on your backups.  I had multiple year end 2025 backups on different sources before I even made the first attempt at the software update. I was able to reload the information from an external hard drive.  I have 24/25 loaded on a completely separate computer and I have checked it, all 24/25 information is there.  On a different computer, I have 25/26 loaded.  Some of my clients new year is there, and some of my clients cannot even transfer the data base.  The only peace of mind that I have at this point, is that I know I have a completely accurate copy of the data on one computer as of 12/31/25.  Everything that we have processed in the 25/26 program has a paper copy and a backup stored.  I fear that we will lose all of the hours of efforts, and have to re-enter once the program has been corrected.  But, I don't know what other options we have.